/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project 
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may 
 *    appear in the software itself, if and wherever such third-party 
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
 *    or promote products derived from this software without prior 
 *    written permission. For written permission, please contact 
 *    license@jpos.org.
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package com.nasoft.core;

/**
 * SubConfiguration objects lets childs objects access attributes in its parent
 * object with a given prefix, for example "child.". Child objects can access
 * properties with their prefix removed.
 * 
 * @author <a href="mailto:alcarraz@iie.edu.uy">Andr?s Alcarraz</a>
 * @version $Id: SubConfiguration.java,v 1.2 2003/05/16 04:07:35 alwyns Exp $
 */
public class SubConfiguration implements Configuration
{
  /** Parent Configuration */
  protected Configuration cfg;
  /** prefix identifying the child parameters */
  protected String        prefix;

  /** Creates a new empty SubConfiguration object */
  public SubConfiguration()
  {
    super();
  }

  /**
   * Creates a new SubConfiguration from its parent's Configuration and the a
   * given <code>prefix</code>.
   * 
   * @param cfg
   *          Parent's Configuration
   * @param prefix
   *          prefix identifying child parameters.
   */
  public SubConfiguration(Configuration cfg, String prefix)
  {
    super();
    this.cfg = cfg;
    this.prefix = prefix;
  }

  /**
   * Sets the container configuration.
   * 
   * @param newCfg
   *          New container configuration.
   */
  public void setConfiguration(Configuration newCfg)
  {
    cfg = newCfg;
  }

  /**
   * Sets the prefix that identifies the parameters of the child object inside
   * the parent configuration.
   * 
   * @param newPrefix
   *          New prefix
   */
  public void setPrefix(String newPrefix)
  {
    prefix = newPrefix;
  }

  public String get(String propertyName)
  {
    return cfg.get(prefix + propertyName);
  }

  public String[] getAll(String propertyName)
  {
    return cfg.getAll(prefix + propertyName);
  }

  public String get(String propertyName, String defaultValue)
  {
    return cfg.get(prefix + propertyName, defaultValue);
  }

  public boolean getBoolean(String propertyName)
  {
    return cfg.getBoolean(prefix + propertyName);
  }

  public boolean getBoolean(String propertyName, boolean defaultValue)
  {
    return cfg.getBoolean(prefix + propertyName, defaultValue);
  }

  public double getDouble(String propertyName)
  {
    return cfg.getDouble(prefix + propertyName);
  }

  public double getDouble(String propertyName, double defaultValue)
  {
    return cfg.getDouble(prefix + propertyName, defaultValue);
  }

  public long getLong(String propertyName)
  {
    return cfg.getLong(prefix + propertyName);
  }

  public long getLong(String propertyName, long defaultValue)
  {
    return cfg.getLong(prefix + propertyName, defaultValue);
  }

  public int getInt(String propertyName)
  {
    return cfg.getInt(prefix + propertyName);
  }

  public int getInt(String propertyName, int defaultValue)
  {
    return cfg.getInt(prefix + propertyName, defaultValue);
  }

  /**
   * Creates a new object, it takes the class from the value of the property
   * <code>propertyName</code>
   * 
   * @param propertyName
   *          Property whose value is the class name of the object being
   *          created.
   */
  public Object getObject(String propertyName) throws ConfigurationException
  {
    try
    {
      // Class[] paramTypes = {};
      // Object[] params = {};
      Object ret = Class.forName(get(propertyName)).newInstance();
      if (ret instanceof Configurable)
        ((Configurable) ret).setConfiguration(this);
      return ret;
    } catch (Exception e)
    {
      throw new ConfigurationException("Error trying to create an "
          + "object from property " + prefix + propertyName, e);
    }
  }
}
